From now it's an old topic and old question lol. I heard that people still continue to get Bitcoins even it's at $ 15K recently. So it seems like it's never too late to buy Btc.
It's never too late to buy bitcoin and for those people who bought at $15,000 probably they have earned when bitcoin hit $17,000 and now as the price starts to drip down at $14,200 still there will be people who are buying on this moment since the price is starting to get down.
I think we are going to reach a point where bitcoin is truly too expensive lets say that bitcoin reaches 100k, who has 100k to spare to buy a bitcoin at that point, only those that are very rich, obviously we do not need to buy a full bitcoin but still bitcoin will be too expensive for most people at that point, that is why I have always thought that those that hold a minimum of 10 bitcoins are going to be very wealthy in the future.